<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片-->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--引入第三方树形组件-->
      <tree-table :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index border :show-row-hover="false" class="tree-table">
        <!--是否有效-->
        <template v-slot:isok="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <!--排序-->
        <template v-slot:order="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!--操作-->
        <template v-slot:opt="">
          <el-button icon="el-icon-edit" size="mini" type="primary">编辑</el-button>
          <el-button icon="el-icon-delete" size="mini" type="danger">删除</el-button>
        </template>
      </tree-table>
      <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="queryInfo.pagenum"
      :page-sizes="[2, 5, 10, 15]"
      :page-size="queryInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
    </el-card>
      <!--添加分类对话框-->
      <el-dialog
        @close="setCateDialogClosed"
        title="添加分类"
        :visible.sync="setCateDialogVisible"
        width="50%">
        <el-form :model="addCateForm" :rules="addCateRules" ref="addCateRef" label-width="100px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类">
            <!--级联选择框-->
            <el-cascader
              clearable
              v-model="selectedKeys"
              :options="parentCateList"
              :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }"
              @change="parentCateChange">
            </el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="setCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      cateList: [],
      columns: [
        { label: '分类名称', prop: 'cat_name' },
        // 自定义模板列，使用到了作用于插槽
        { label: '是否有效', type: 'template', template: 'isok' },
        { label: '排序', type: 'template', template: 'order' },
        { label: '操作', type: 'template', template: 'opt' }
      ],
      total: 0,
      setCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_id: 0,
        cat_level: 0
      },
      addCateRules: {
        cat_name: [
          { required: true, message: '分类名称必须填写', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: result } = await this.$http.get('categories', { params: this.queryInfo })
      if (result.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      this.cateList = result.data.result
      this.total = result.data.total
    },
    // 监听分页pagesize改变的函数
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变的函数
    handleCurrentChange (newSize) {
      this.queryInfo.pagenum = newSize
      this.getCateList()
    },
    showCateDialog () {
      this.getParentCateList()
      this.setCateDialogVisible = true
    },
    async getParentCateList () {
      const { data: result } = await this.$http.get('categories', { params: { type: 2 } })
      if (result.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败！')
      }
      this.parentCateList = result.data
    },
    parentCateChange () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_id = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return false
      } else {
        this.addCateForm.cat_id = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate () {
      this.$refs.addCateRef.validate(async valid => {
        if (!valid) {
          return false
        }
        const { data: result } = await this.$http.post('categories', this.addCateForm)
        if (result.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.setCateDialogVisible = false
      })
    },
    setCateDialogClosed () {
      this.$refs.addCateRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_id = 0
      this.addCateForm.cat_level = 0
    }
  }

}
</script>

<style lang="less" scoped>
.tree-table {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
